7

FN6397.2

March 20, 2007

Pin Descriptions

PIN

NUMBER

SYMBOL

DESCRIPTION

1

BHB

B High-side Bootstrap supply. External bootstrap diode and capacitor are required. Connect cathode of bootstrap

diode and positive side of bootstrap capacitor to this pin. Internal charge pump supplies 30

μA out of this pin to

maintain bootstrap supply. Internal circuitry clamps the bootstrap supply to approximately 12.8V.

2

HEN

High-side Enable input. Logic level input that when low overrides IN+/IN- (Pins 6 and 7) to put AHO and BHO drivers

(Pins 11 and 20) in low output state. When HEN is high AHO and BHO are controlled by IN+/IN- inputs. The pin can

3

DIS

DISable input. Logic level input that when taken high sets all four outputs low. DIS high overrides all other inputs.

When DIS is taken low the outputs are controlled by the other inputs. The pin can be driven by signal levels of 0V to

Chip negative supply, generally will be ground.

5

OUT

OUTput of the input control comparator. This output can be used for feedback and hysteresis.

6

IN+

Noninverting input of control comparator. If IN+ is greater than IN- (Pin 7) then ALO and BHO are low level outputs

and BLO and AHO are high level outputs. If IN+ is less than IN- then ALO and BHO are high level outputs and BLO

and AHO are low level outputs. DIS (Pin 3) high level will override IN+/IN- control for all outputs. HEN (Pin 2) low level

will override IN+/IN- control of AHO and BHO. When switching in four quadrant mode, dead time in a half bridge leg

is controlled by HDEL and LDEL (Pins 8 and 9).

7

IN-

Inverting input of control comparator. See IN+ (Pin 6) description.

8

HDEL

both high-side drivers. The low-side drivers turn-off with no adjustable delay, so the HDEL resistor guarantees no

shoot-through by delaying the turn-on of the high-side drivers. HDEL reference voltage is approximately 5.1V.

9

LDEL

both low-side drivers. The high-side drivers turn-off with no adjustable delay, so the LDEL resistor guarantees no

shoot-through by delaying the turn-on of the low-side drivers. LDEL reference voltage is approximately 5.1V.

10

AHB

A High-side Bootstrap supply. External bootstrap diode and capacitor are required. Connect cathode of bootstrap

diode and positive side of bootstrap capacitor to this pin. Internal charge pump supplies 30

μA out of this pin to

maintain bootstrap supply. Internal circuitry clamps the bootstrap supply to approximately 12.8V.

11

AHO

A High-side Output. Connect to gate of A High-side power MOSFET.

12

AHS

A High-side Source connection. Connect to source of A High-side power MOSFET. Connect negative side of

bootstrap capacitor to this pin.

13

ALO

A Low-side Output. Connect to gate of A Low-side power MOSFET.

14

ALS

A Low-side Source connection. Connect to source of A Low-side power MOSFET.

15

16

17

BLS

B Low-side Source connection. Connect to source of B Low-side power MOSFET.

18

BLO

B Low-side Output. Connect to gate of B Low-side power MOSFET.

19

BHS

B High-side Source connection. Connect to source of B High-side power MOSFET. Connect negative side of

bootstrap capacitor to this pin.

20

BHO

B High-side Output. Connect to gate of B High-side power MOSFET.

ISL83204A